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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa1ab024f3412d4f77e1b79167612b97f1b98acc716ca5eb676c393662db08b' 
  AND token = 'SR2OoEK/sFmm/wfz7eB6DIFeDLCMcuBhgcAgaX5UKBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}